Francisco P. answered • 09/17/14

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The original volume contains 15 cc of alcohol in a 100 cc volume because 15% of 100 is 15. If you add 50 cc of pure alcohol to the original, you would have 15 + 50 = 65 cc of alcohol in a new volume of 100 + 50 = 150 cc.

The new percentage of alcohol is 65/150*100% = 43.3 %